Electric switch



July 1, 1930. A P L 1,769,600

ELECTRIC; SWITCH Filed May 22, 1928 2 Sheets-Sheet l I 5 Z 3 A 16g gwue'ntoo July 1, 1930. v I PAHL 1,769,600

- ELECTRIC SWITCH Filed May 22, 1928 2 Sheets-Sheet 2 gwuewtoo Patented July 1, 1930 AUGus'r J". PAHLfor'sAnrI-mncisco, CALIFORNIA Ennornrc swrron Y I Application filed May 22, 1928. Serial 110,279,848. 1

This invention relates to a switch especially Figure 3 is a plan viewo'f aportion'of one 7 of, the swltch; arms at the place Where itjoins.

intended for heavy duty work Where it is necessary to supply means to lncrease the pressure of the contacts upon one ofthe contact blades, andto, at'the same time pro- ,Vide means whereby the pressure of contacts may be released when an attempt is made to i remove the blade from the spring contacts.

It will be understood by those skilled in the art that where high'ten sioned switches .are

exposed to the atmosphere for a long period, and where other heavy duty switches are per.-

mitted to remain engaged with the spring contacts for a long time, that the tendency is' for the switch blade to become somewhat corroded with the contact with the spring 1 contact point, and it is necessary to provide] a very heavy mechanism to pullthe blade apart from the contact.

In the present instance means is provided to increase the pressure of the spring contact upon the blade at the time of engagementi'of the blade with the spring contact, and to, at

the same time provide. means wherebythe spring cont-act blade will be pulled slightly apart with the attempt to switch from the spring 00 disengage the knife ntact, a special joint being used for this particular purpose.

While this toggle joint effect has been shown in connection with a special high tension form of switch, it will be understoodthat the toggle joint blade releasing mechanism may be applied to any form of heavy duty switch, and thisdescription is not, intended herewith.

parent as the description 7 to be limited tothe particular form of high tension switch illustrated in the drawings proceeds.

An embodiment of the invention is shown in the accompanying drawings 1n whlch the same reference numeral is applied to the same portion throughout the several figures ofthe' drawings and of which th 5 tions.

Figure 1 is a plan view tensioned swltches as it arm showing the contac the contact separated,

ere may be modifica;

of one of these high applies to the cross t separated,

, "the'spring contact. In actual practlce the rod 4 is'rotated by movement allowed therein,

Figure 4t isaside elevation of the spring contact, only a portion of thesupp'orting arm beingillustr'ated, j

Figure 5 is an edge elevation of one-ofthe to Figured, 1 4 Figure ti is aplan'view of the spring contact holder shown in Figure 4:, and.

.one of theknife contacts showing the slight- ,spring contact holders looking at rightangles Figure 7 is a detail illustrating the yoke for adjusting the throw of the toggle joint link. The numeral 1 indicates the cross arm on which the U shaped steel yoke Qismouhted which carries the two rods 3 and'a which turnto permit the switch blade to engage means of the arm 5 whichisconnected to a long wooden pole 6. I The rod 3 is ordinarily fixed substantially in the position indicated.

insulators by means ofsuitable bolts, 13 and 14 at each end. 7 i

The'arm 8 carries the knife switch blade 16 which has the yoke 17 and 'ring'lS secured thereto, which yoke and ring pass around the end of the'rod 8, and a'bolt 19passes through the rod and perm'itsa slight-radial and endwisern'ovement of the knife switch 16 so'that there is a slight play as the knife-blade 16 isbrought intocontact with the spring contact.

The rod 7 carries a, casting 20, with two arms '2 l, 22' projecting upwardly therefrom,

which arms have sloping faces 23, 24 to insure the direction of the switch blade 16 into the spacebetween them, and to guidethe switch blade into the space between the. two spring contacts 25, 26. The spring contactsare connected to a movable block 27 by means of two bOlts 28, 29 and saidspring contacts have The contactcarrying-arms 7 and 8 are-connected to the outer insulators 9 and 10, said insulators being also connected 'to'another insulat'or1land 12 in a manner :well "known n e Qfil attheblQQ T i r etoup'and down slightly save where the attachi g inent thereto of four links 34.

1 The links'3 l, 35 areipivotally connectedto a lug 38 onthe spring contact 3Q, while the posed contact surfaces, a switch blade adapted to engage said surfaces, and links secured at the extending ends of said clips adapted to pull them apart as the Switchblade is withdrawn 7 therefrom to-therebypermit an easy withdrawal of said switch blade.

In testimony whereof Ihavehereunto set liny hand this 9th day of May, A. D. 1928.

AUGUST 'J. 'PAHL.

links "36,, 37 i are pivotally connected to a lug .3991; the spring,-contact1. 'Theselinksex *1tend'thr llg ihqle inthe ba k' f sp i i r 'f contact;andIarQpiVotaHy connected to two ay'okes e 4 0, il,' l said yokes beingheldiin a fixed .jposition by reason are t11e b 1 "42, 4s which I bolts have a: washer l, itfi riveted. thereto 20 in each instance, said bolt and washers hold- "jus'tinent so as'to insure the proper pressure a beingapplied by thespring'contact 30, 31 to the knife switch, and at thesarne time they 315251 insure the; separation. of the spring contacts heneve anv attempt is made to p'ull the knife nde'away nom th'e spring contact.

v T It wi llfbe observed that if the knife blade is but w y: ,l i'gh -t htq e -=t a1 t actual 3 t a v r i when the links are elach in'; alignment that fi le s edema Wei-l baton-t ose links to Cause ,when a t n ptjis madeto releas'eg'the blade e insure-the immediate releasejlo fthe blade.

separating theispringl contacts from each j nary type of high ,tensioned 1 switch, that it no 1 applied to anyheayy duty switch t ah feb ads'atth enient p pe 1 a V'Having thus described my invention, what desire to; securer by Letters Patent of the a United Statesisy-as f uows, but/ modifications j may be made in .7 urf i m t the invention fiSTShoWn; in i the; drawings and in the above he 1 spri ten d? b ar; W01 th blade ithyerygreat force when the blade isforced we es he s rin fi a twi d s m y A lf ting niaybedilzto friction or the act that the blade iscorroded ingoon'tact with -.f-. he=. pti s enact wil ge u i e links to I separate thelspringcontactsZsiifficiently'so as other assho'wnin connection with Ian ordia It: Will befapparent that th s method'of the sp' ring. ,contacts areto, heiforced m en aeem aw fil 'kn fel ad e y, i n where it is necessary to pro ide positive or "disengaging the spring contact a l particularlydescribed forin thereof, within .7

e 1 thei purv e "v69 f nGl i to 1 minalthl cka upo tis i litermiaal' blQQ fl hn d t engage a switch blade said contacts heing formed by ofthe annexed clailn.

, I bending the clips back upon themselves and havlng their ends .for rning'oppositely dis-,

contact. clips secured 

